1 // SPDX-License-Identifier: GPL-2.0
3 * ACPI 3.0 based NUMA setup
4 * Copyright 2004 Andi Kleen, SuSE Labs.
6 * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
8 * Called from acpi_numa_init while reading the SRAT and SLIT tables.
9 * Assumes all memory regions belonging to a single proximity domain
10 * are in one chunk. Holes between them will be included in the node.
13 #include <linux/kernel.h>
14 #include <linux/acpi.h>
15 #include <linux/mmzone.h>
16 #include <linux/bitmap.h>
17 #include <linux/init.h>
18 #include <linux/topology.h>
20 #include <asm/proto.h>
22 #include <asm/e820/api.h>
24 #include <asm/uv/uv.h>
26 /* Callback for Proximity Domain -> x2APIC mapping */
28 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
35 if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
39 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
41 pxm = pa->proximity_domain;
42 apic_id = pa->apic_id;
43 if (!apic_id_valid(apic_id)) {
44 pr_info("SRAT: PXM %u -> X2APIC 0x%04x ignored\n", pxm, apic_id);
47 node = acpi_map_pxm_to_node(pxm);
49 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
54 if (apic_id >= MAX_LOCAL_APIC) {
55 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
58 set_apicid_to_node(apic_id, node);
59 node_set(node, numa_nodes_parsed);
60 pr_debug("SRAT: PXM %u -> APIC 0x%04x -> Node %u\n", pxm, apic_id, node);
63 /* Callback for Proximity Domain -> LAPIC mapping */
65 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
72 if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
76 if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
78 pxm = pa->proximity_domain_lo;
79 if (acpi_srat_revision >= 2)
80 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
81 node = acpi_map_pxm_to_node(pxm);
83 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
88 if (get_uv_system_type() >= UV_X2APIC)
89 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
91 apic_id = pa->apic_id;
93 if (apic_id >= MAX_LOCAL_APIC) {
94 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
98 set_apicid_to_node(apic_id, node);
99 node_set(node, numa_nodes_parsed);
100 pr_debug("SRAT: PXM %u -> APIC 0x%02x -> Node %u\n", pxm, apic_id, node);
103 int __init x86_acpi_numa_init(void)
107 ret = acpi_numa_init();
110 return srat_disabled() ? -EINVAL : 0;